What cytokine stimulates plasma cells to secrete IgA?
A) interleukin-5
B) interleukin-10
C) interleukin-4
D) interferon-gamma
E) interferon-alpha
Answer: A) interleukin-5
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Which of the following is not a complementary base pair usually found in DNA molecules?
A. Adenine-uracil B. Guanine-cytosine C. Adenine-thymine D. All of the choices are correct.
Which factors are needed to recognize the stop codon and disassemble the translation machinery?
A. elongation factors B. release factors C. transcription factors D. inititaion factors E. mRNA factors
Indirect methods for measuring mutation rates make inferences from levels of genetic variation between and among ____________________
Fill in the blank(s) with correct word
Planarians lack dedicated respiratory and circulatory systems because _____
A) none of their cells are far removed from the gastrovascular cavity or from the external environment B) they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm C) their flame bulbs can carry out respiratory and circulatory functions D) their body cavity, a pseudocoelom, carries out these functions